Derrick



(No Model.) 2 Sheets-Sheet 1.

M. BEAL. DERRICK.

'No. 531,249. Patented Dec. 18, 1894.

FIG. 1-

WITNESSES. v f INVENTOR.

PATENT OFFICE.

MosEs BEAL, or ELYRIA, OHIO.

DERRICK.

SPECIFICATION forming part of Letters Patent No; 531 ,249, dated December 18,1 894.

' Applicationfilecl February 6, 1893. Serial No. 461,096. (ll o model.)

To all whom it mdy concern.-

Be it known, that I, MOSES BEAL, a citizen of the United States, residing at Elyria, in the county of Lorain and State'of Ohio, haveinvented certain new and useful Improvements in Derricks and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to improvements in derricks, and it consists in the details of construction, and in the combination of parts hereinafter described and pointed out definitely in the claims.

In the drawings, Figure 1 is a side elevation of my improved derrick. Fig. 2 is aplan view of the same. Fig. 3 is a vertical sectional view of the lower part of the post and surrounding parts. Fig. 4 is'a vertical sectional view of the upper part of the post and the parts adjacent thereto; and Fig. 5 is a plan view of a modified form of the mechanism for turning the main post.

Referring by letters to the several parts, A represents a tubular post, which is secured in a socketin the plate B. As shown, the plate B is composed of two parts b and b, which are bolted together,-but it is immaterial whether it be composed of one or more pieces. Projecting downward from the plate B is a cylindrical neck, which enters a similarly shaped hole in the base plate E, which as shown, is secured to the movable frame which supports the motor and other parts of the operating machinery.

0 represents the guy plate, which is pro vided with a hollow cylindrical stem 0. The guy plate is pivoted to said upper end, the stem 0 entering the top of the post -'A. The guy plate, being itself held by guy ropes, holds the post upright, but the post is permitted to revolve about a vertical axis.

A collar D is shrunk on to, or is otherwise rigidly secured to the upper end of the post A. It is in the form of an inverted cup at its upper end, and forms the race way for a series of friction balls, the portion thereof which does so rest being approximately cone shaped. A series of friction balls is also introduced between the plates B and E, the latter being provided with an annular groove,

motor and the post is first made, the post will the former wi th'a cone shaped formation, to' form the race way for said balls. The ball bearings at the top and foot of the post A greatly reduce the friction incident to turning the post on its axis.

Projecting upward from the guy plate C, are the two ears 0, to which the sheave c is journaled, one edge of said sheave being approximately in line with the axis of the post A. I I The boom G is pivoted to the plate B. A collar g is shrunk onor otherwise secured to the post A, near the top thereof, and to this collar the brace g is pivoted. The lower end of this brace is connected with the boom by a pin 9 which passes through holes in both the boom andbrace. Both of these parts are provided with a series of holes, any of which may be used for the described purpose, whereby the angle of the boom to the post A may be varied at will. Above the point at which the boom is connected with the post A, said postis slotted. A sheave 01 passes through this slot; and it is pivoted to a collard ,which is rigidly secured to the post. The outer end of the boom G, carries a sheave 9 'The hoisting rope passes over the sheave 9 under the sheave d, over the sheave c and down to the hoisting drum. To turn thepost on its axis, suitable mechanism is provided which is operated by the contact of two friction wheels, whereby, when the connection between the begin to move very slowly, owing tothe slipping of the friction surfaces, thus preventing jar and undue strain.

In the formof the device shown in Figs. 1 and 2, a circle J, or segment of a circle, is secured to the plate B. Mounted on the supporting frame is a shaft K, to which are rigidly attached two sheaves 10 it. Mounted on this shaft and secured thereto by a tongue and groove connection, is a longitudinally movable friction wheel, having on its edges two oppositely beveled surfaces. Secured to the driving shaft M is a co-operating friction wheel I, with which the frictionwheel L may be caused to engage on either side of the axis of said wheel I, as the wheel L is moved in one direction or the other by the fork lever Z. This fork lever is pivoted to some fixed support, and engages in an annular groove in the ICC hub of the friction wheel L. A rope, cable or chain N is secured to the front edge of the circle J. It extends in a groove in said circle in opposite directions from its point of connection thereto, and its ends are secured to and wound in opposite directions upon the two drums 7c 76' respectively. hen the friction wheels I and L are in contact, the shaft K is revolved in one direction or the other as the case may be. This causes one end of the rope N to be wound up on its sheave, when at the same time the other end of the rope is unwound from its sheave. The winding up of one end of the rope causes the post A to turn about a vertical axis.

A modification of the friction device for turning the post is shown in Fig. 5. On the under side of the plate B, a beveled gear b is secured, which meshes with the beveled gear t, on the end of the shaft T. This shaft is mounted in suitable bearings on the frame which supports the other parts of the device. On the opposite end of the shaft T, a friction wheel 25' is secured, which lies between the two flangespp on the sliding sleeve P. This sleeve is mounted on the driven shaft R, and is connected thereto by a tongue and groove. It is moved by a fork lever S in either direction, so as to bring either flange p or 1) into contact with the friction wheel 15'. When one of these flanges is in contact with the wheel t, the shaft T is revolved in one direc tion. When the other flange is in contact therewith, the shaft is revolved in the other direction, the post being revolved in both both cases.

Having described my invention, I claim-- 1. The combination of a fixed base-plate E, a fixed guy plate 0 having a central vertical hole, a hollow vertical post A wh ich is mounted at its upper and lower ends respectively in said base plate and guy plate, whereby said post is adapted to rotate upon its vertical axis, said post having a slot near its lower end, a sheave e mounted on the guy plate, a sheave d mounted on the post and projecting through the said slot therein, with a boom pivoted to said post, a collar 9 secured to said post, a brace g pivoted to said collar, means for adjustably connecting said brace and boom, a sheave g on the end of said boom, and a hoisting cable passing over the sheaves g, d and 0 substantially as and for the purpose specified.

2. The combination of a fixed base plate E,

having a cylindrical opening, a plate B having a cylindrical neck which enters said opening, and ball bearings between said two plates whereby the plate B may turn upon a vertical axis, a hollow vertical post secured to said plate B having a slot near its lower end, a collar D rigidly secured to the upper end of said post, a fixed guy plate 0 having a tubular cylindrical stem which enters the upper end of said post, ball bearings between the collar D and guy plate 0, a sheave mounted on the'guy plate extending over to near the axis of the post, a sheave mounted on the post and projecting through the slot therein, a boom carried by said post, and mechanism for moving said post upon its vertical axis, substantial] y as and for the purpose specified.

In testimony whereof Iatiix my signature in presence of two witnesses.

MOSES BEAT \Vitnesses:

E. L. TI-IURSTON, FRANK MILLER. 

